fn main() {
let mut val = b'\r';
println!("{}", val.is_ascii_whitespace());
val = b'\t';
println!("{}", val.is_ascii_whitespace());
val = b' ';
println!("{}", val.is_ascii_whitespace());
val = b'\n';
println!("{}", val.is_ascii_whitespace());
}
/*
run:
true
true
true
true
*/